Speaker mount adaptor plate



FIG. 1 is a front perspective view of a speaker mount adapter plate;

FIG. 2 is a rear perspective view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a side elevational view thereof; and

FIG. 6 is an end elevational view thereof. 

The ornamental design for a speaker mount adaptor plate, as shown and described. 